French President Emmanuel Macron (right) and New Zealand's Prime Minister Jacinda Ardern (left) attend a launching ceremony in Paris for the Christchurch Call, an initiative pushed by Ardern after a self-described white supremacist gunned down 51 people in a massacre at two mosques in the New Zealand city in March. Photo: AFP

French President Emmanuel Macron (right) and New Zealand's Prime Minister Jacinda Ardern (left) attend a launching ceremony in Paris for the Christchurch Call, an initiative pushed by Ardern after a self-described white supremacist gunned down 51 people in a massacre at two mosques in the New Zealand city in March. Photo: AFP